The numbers of students of three classes of a school are in the ratio 4 : 5 : 6. If numbers of students in these classes increase by 25%, 20% and 25% respectively, then ratio of numbers of students will become:
1
5 : 6 : 15
2
10 : 30 : 12
3
10 : 12 : 15
4
15 : 5 : 6